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  • Some help needed with setting up the PERFECT workflow for web development with 2-3 guys using subver

    - by Roeland
    Hey guys! I run a small web development company along side with my brother and friend. After doing extensive research I have decided on using subversion for version control. Here is how I currently plan on running typical development. Keep in mind there are 3 of us each in a separate location. I set up an account with springloops (springloops.com) subversion hosting. Each time I work on a new project, I create a repository for it. So lets say in this case I am working on site1. I want to have 3 versions of the site on the internet: Web Development - This is the server me and the other developers publish to. (site1.dev.bythepixel.com) Client Preview - This is the server that we update every few days with a good revision for the client to see. (site1.bythepixel.com) Live Site - The site I publish to when going live (site1.com) Each web development machine (at each location) will have a local copy of xamp running virtual host to allow multiple websites to be worked on. The root of the local copy is set up to be the same as the local copy of the subversion repository. This is set up so we can make small tweaks and preview them immediately. When some work has been done, a commit is made to the repository for the site. I will have the dev site automatically be pushed (its an option in springloops). Then, whenever I feel ready to push to the client site I will do so. Now, I have a few concerns with those work flow: I am using codeigniter currently, and in the config file I generally set the root of the site. Ex. http://www.site1.com. So, it looks like each time I publish to one of the internet servers, I will have to modify the config file? Is there any way to make it so certain files are set for each server? So when I hit publish to client preview it just uploads the config file for the client preview server. I don't want the live site , the client preview site and the dev site to share the same mysql server for a variety of reasons. So does this once again mean that I have to adjust the db server info each time I push to a different site? Does this workflow make sense? If you have any suggestion please let me know. I plan for this to be the work flow I use for the next few year. I just need to put a system in place that allows for future expansion! Thanks a bunch!!

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  • What is New in ASP.NET 4 Web Development Overview

    - by Aamir Hasan
     Microsoft Recently Microsoft introduce Visual  studio 2010 which have new feature's Name of some new Features are given below. In ASP.NET 4.O has focus on performance and Search Engine Optimization. I'll be taking a look at what I think are the most important new features in ASP.NET 4.Output cache extensibility Session state compression View state mode for individual control Page.MetaKeyword and Page.MetaDescription properties Response.RedirectPermanent method Routing in ASP.NET Increase the URL character length New syntax for Html Encode Predictable Client IDs Web.config file refactoring Auto-Start ASP.NET applications Improvements on Microsoft Ajax LibraryReference:ASP.NET 4 and Visual Studio 2010 Web Development Overview 

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  • How to Setup Gmail for Custom Domains on the Kindle Fire’s Email App

    - by The Geek
    If you’ve just opened your shiny new Kindle Fire and tried to connect it to Gmail using your own custom (not @gmail.com) email address, you might be in for a surprise: the email account wizard has no idea how to handle this scenario, even if you pick Gmail at the beginning. Here’s how to fix it. Note: we’re in the middle of doing a thorough test of the Kindle Fire, and we’ll post our in-depth review in the next few days. So far: it’s a great tablet for the price. Use Your Android Phone to Comparison Shop: 4 Scanner Apps Reviewed How to Run Android Apps on Your Desktop the Easy Way HTG Explains: Do You Really Need to Defrag Your PC?

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  • Single Sign On for a Web App

    - by Jeremy Goodell
    I have been trying to understand how this problem is solved for over a month now. I really need to come up with a general approach that works -- I'm basically the only resource who can do it. I have a theory, but I'm just not sure it's the easiest (or correct) approach and I haven't been able to find any information to support my ideas. Here's the scenario: 1) You have a complex web application that offers secure content on a subscription basis. 2) Users are required to log in to your application with user name and password. 3) You sell to large corporations, which already have a corporate authentication technology (for example, Active Directory). 4) You would like to integrate with the corporate authentication mechanism to allow their users to log onto your Web App without having to enter their user name and password. Now, any solution you come up with will have to provide a mechanism for: adding new users removing users changing user information allowing users to log in Ideally, all these would happen "automagically" when the corporate customer made the corresponding changes to their own authentication. Now, I have a theory that the way to do this (at least for Active Directory) would be for me to write a client-side app that integrates with the customer's Active Directory to track the targeted changes, and then communicate those changes to my Web App. I think that if this communication were done via Web Services offered by my web app, then it would maintain an unhackable level of security, which would obviously be a requirement for these corporate customers. I've found some information about a Microsoft product called Active Directory Federation Service (ADFS) which may or may not be the right approach for me. It seems to be a bit bulky and have some requirements that might not work for all customers. For other existing ID scenarios (like Athens and Shibboleth), I don't think a client application is necessary. It's probably just a matter of tying into the existing ID services. I would appreciate any advice anyone has on anything I've mentioned here. In particular, if you can tell me if my theory is correct about providing a client-side app that communicates with server-side Web Services, or if I'm totally going in the wrong direction. Also, if you could point me at any web sites or articles that explain how to do this, I'd really appreciate it. My research has not turned up much so far. Finally, if you could let me know of any Web applications that currently offer this service (particularly as tied to a corporate Active Directory), I would be very grateful. I am wondering if other B2B Web app's like salesforce.com, or hoovers.com offer a similar service for their corporate customers. I hate being in the dark and would greatly appreciate any light you can shed ... Jeremy

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  • not using partial mocking? do they also mean in web-app?

    - by 01
    Im learning Mockito and in chapter 16 they say you should not use partial mocking in new system. I disagree, for example in one of my actions i use partial mocking for static framework methods, sql calls, etc. I extracted the stuff into methods and then mock it in tests. Most of those methods are specific to this action and wont be call from other actions, so it not worth to extract special components. I agree that you shouldn't using partial mocking in frameworks, but not in hard to mock actions. What are minuses of using partial mocking in web-app?

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  • Windows Azure Use Case: Hybrid Applications

    - by BuckWoody
    This is one in a series of posts on when and where to use a distributed architecture design in your organization's computing needs. You can find the main post here: http://blogs.msdn.com/b/buckwoody/archive/2011/01/18/windows-azure-and-sql-azure-use-cases.aspx  Description: Organizations see the need for computing infrastructures that they can “rent” or pay for only when they need them. They also understand the benefits of distributed computing, but do not want to create this infrastructure themselves. However, they may have considerations that prevent them from moving all of their current IT investment to a distributed environment: Private data (do not want to send or store sensitive data off-site) High dollar investment in current infrastructure Applications currently running well, but may need additional periodic capacity Current applications not designed in a stateless fashion In these situations, a “hybrid” approach works best. In fact, with Windows Azure, a hybrid approach is an optimal way to implement distributed computing even when the stipulations above do not apply. Keeping a majority of the computing function in an organization local while exploring and expanding that footprint into Windows and SQL Azure is a good migration or expansion strategy. A “hybrid” architecture merely means that part of a computing cycle is shared between two architectures. For instance, some level of computing might be done in a Windows Azure web-based application, while the data is stored locally at the organization. Implementation: There are multiple methods for implementing a hybrid architecture, in a spectrum from very little interaction from the local infrastructure to Windows or SQL Azure. The patterns fall into two broad schemas, and even these can be mixed. 1. Client-Centric Hybrid Patterns In this pattern, programs are coded such that the client system sends queries or compute requests to multiple systems. The “client” in this case might be a web-based codeset actually stored on another system (which acts as a client, the user’s device serving as the presentation layer) or a compiled program. In either case, the code on the client requestor carries the burden of defining the layout of the requests. While this pattern is often the easiest to code, it’s the most brittle. Any change in the architecture must be reflected on each client, but this can be mitigated by using a centralized system as the client such as in the web scenario. 2. System-Centric Hybrid Patterns Another approach is to create a distributed architecture by turning on-site systems into “services” that can be called from Windows Azure using the service Bus or the Access Control Services (ACS) capabilities. Code calls from a series of in-process client application. In this pattern you move the “client” interface into the server application logic. If you do not wish to change the application itself, you can “layer” the results of the code return using a product (such as Microsoft BizTalk) that exposes a Web Services Definition Language (WSDL) endpoint to Windows Azure using the Application Fabric. In effect, this is similar to creating a Service Oriented Architecture (SOA) environment, and has the advantage of de-coupling your computing architecture. If each system offers a “service” of the results of some software processing, the operating system or platform becomes immaterial, assuming it adheres to a service contract. There are important considerations when you federate a system, whether to Windows or SQL Azure or any other distributed architecture. While these considerations are consistent with coding any application for distributed computing, they are especially important for a hybrid application. Connection resiliency - Applications on-premise normally have low-latency and good connection properties, something you’re not always guaranteed in a distributed and hybrid application. Whether a centralized client or a distributed one, the code should be able to handle extended retry logic. Authorization and Access - In a single authorization environment like a Active Directory domain, security is handled at a user-password level. In a distributed computing environment, you have more options. You can mitigate this with  using The Windows Azure Application Fabric feature of ACS to make the Azure application aware of the App Fabric as an ADFS provider. However, a claims-based authentication structure is often a superior choice.  Consistency and Concurrency - When you have a Relational Database Management System (RDBMS), Consistency and Concurrency are part of the design. In a Service Architecture, you need to plan for sequential message handling and lifecycle. Resources: How to Build a Hybrid On-Premise/In Cloud Application: http://blogs.msdn.com/b/ignitionshowcase/archive/2010/11/09/how-to-build-a-hybrid-on-premise-in-cloud-application.aspx  General Architecture guidance: http://blogs.msdn.com/b/buckwoody/archive/2010/12/21/windows-azure-learning-plan-architecture.aspx   

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  • Web-Applikationen entwickeln mit Oracle Application Express

    - by britta.wolf
    Mit Oracle Application Express können schnell und einfach datenbankgestützte Web-Anwendungen erstellt werden. Das Tool wird kostenlos (!) über das Oracle Technology Network (OTN) bereitgestellt und kann für alle Zwecke eingesetzt werden. Wer sich über das relativ umfangreiche APEX-Material auf OTN hinaus informieren möchte, dem empfehle ich wärmstens die deutschsprachige APEX-Community-Seite. Die Webseite wird super gepflegt und bietet Einsteigerinformationen, regelmäßige Neuigkeiten, nützliche Tipps und weiterführende Links, sowie Hinweise zu Community-Treffen oder Web-Sessions. Es besteht derzeit die Möglichkeit, auf die neueste Version, die sogenannte Early Adopter Version (EA Phase2) von APEX 4.0 zuzugreifen: http://tryapexnow.com/ Zuerst müssen Sie sich registrieren. Danach fordern Sie Ihren persönlichen Workspace (Arbeitsbereich) an. Innerhalb weniger Minuten bekommen Sie per Mail die Bestätigung und eine Aufforderung, die Account-Erstellung zu finalisieren. Und dann kann es los gehen...!

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  • How to allow bind in app armor?

    - by WitchCraft
    Question: I did setup bind9 as described here: http://ubuntuforums.org/showthread.php?p=12149576#post12149576 Now I have a little problem with apparmor: If I switch it off, it works. If apparmor runs, it doesn't work, and I get the following dmesg output: [ 23.809767] type=1400 audit(1344097913.519:11): apparmor="STATUS" operation="profile_replace" name="/sbin/dhclient" pid=1540 comm="apparmor_parser" [ 23.811537] type=1400 audit(1344097913.519:12): apparmor="STATUS" operation="profile_replace" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=1540 comm="apparmor_parser" [ 23.812514] type=1400 audit(1344097913.523:13): apparmor="STATUS" operation="profile_replace" name="/usr/lib/connman/scripts/dhclient-script" pid=1540 comm="apparmor_parser" [ 23.821999] type=1400 audit(1344097913.531:14): apparmor="STATUS" operation="profile_load" name="/usr/sbin/mysqld" pid=1544 comm="apparmor_parser" [ 23.845085] type=1400 audit(1344097913.555:15): apparmor="STATUS" operation="profile_load" name="/usr/sbin/libvirtd" pid=1543 comm="apparmor_parser" [ 23.849051] type=1400 audit(1344097913.559:16): apparmor="STATUS" operation="profile_load" name="/usr/sbin/named" pid=1545 comm="apparmor_parser" [ 23.849509] type=1400 audit(1344097913.559:17): apparmor="STATUS" operation="profile_load" name="/usr/lib/libvirt/virt-aa-helper" pid=1542 comm="apparmor_parser" [ 23.851597] type=1400 audit(1344097913.559:18): apparmor="STATUS" operation="profile_load" name="/usr/sbin/tcpdump" pid=1547 comm="apparmor_parser" [ 24.415193] type=1400 audit(1344097914.123:19): apparmor="STATUS" operation="profile_replace" name="/usr/sbin/mysqld" pid=1625 comm="apparmor_parser" [ 24.738631] ip_tables: (C) 2000-2006 Netfilter Core Team [ 25.005242] nf_conntrack version 0.5.0 (16384 buckets, 65536 max) [ 25.187939] ADDRCONF(NETDEV_UP): virbr0: link is not ready [ 26.004282] Ebtables v2.0 registered [ 26.068783] ip6_tables: (C) 2000-2006 Netfilter Core Team [ 28.158848] postgres (1900): /proc/1900/oom_adj is deprecated, please use /proc/1900/oom_score_adj instead. [ 29.840079] xenbr0: no IPv6 routers present [ 31.502916] type=1400 audit(1344097919.088:20): apparmor="DENIED" operation="mknod" parent=1984 profile="/usr/sbin/named" name="/var/log/query.log" pid=1989 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 34.336141] xenbr0: port 1(eth0) entering forwarding state [ 38.424359] Event-channel device installed. [ 38.853077] XENBUS: Unable to read cpu state [ 38.854215] XENBUS: Unable to read cpu state [ 38.855231] XENBUS: Unable to read cpu state [ 38.858891] XENBUS: Unable to read cpu state [ 47.411497] device vif1.0 entered promiscuous mode [ 47.429245] ADDRCONF(NETDEV_UP): vif1.0: link is not ready [ 49.366219] virbr0: port 1(vif1.0) entering disabled state [ 49.366705] virbr0: port 1(vif1.0) entering disabled state [ 49.368873] virbr0: mixed no checksumming and other settings. [ 97.273028] type=1400 audit(1344097984.861:21): apparmor="DENIED" operation="mknod" parent=3076 profile="/usr/sbin/named" name="/var/log/query.log" pid=3078 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 277.790627] type=1400 audit(1344098165.377:22): apparmor="DENIED" operation="mknod" parent=3384 profile="/usr/sbin/named" name="/var/log/query.log" pid=3389 comm="named" requested_mask="c" denied_mask="c" fsuid=0 ouid=0 [ 287.812986] type=1400 audit(1344098175.401:23): apparmor="DENIED" operation="mknod" parent=3325 profile="/usr/sbin/named" name="/root/tmp-gjnX0c0dDa" pid=3400 comm="named" requested_mask="c" denied_mask="c" fsuid=0 ouid=0 [ 287.818466] type=1400 audit(1344098175.405:24): apparmor="DENIED" operation="mknod" parent=3325 profile="/usr/sbin/named" name="/root/tmp-CpOtH52qU5" pid=3400 comm="named" requested_mask="c" denied_mask="c" fsuid=0 ouid=0 [ 323.166228] type=1400 audit(1344098210.753:25): apparmor="DENIED" operation="mknod" parent=3422 profile="/usr/sbin/named" name="/var/log/query.log" pid=3427 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 386.512586] type=1400 audit(1344098274.101:26): apparmor="DENIED" operation="mknod" parent=3456 profile="/usr/sbin/named" name="/var/log/query.log" pid=3459 comm="named" requested_mask="c" denied_mask="c" fsuid=0 ouid=0 [ 808.549049] type=1400 audit(1344098696.137:27): apparmor="DENIED" operation="mknod" parent=3872 profile="/usr/sbin/named" name="/var/log/query.log" pid=3877 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 894.671081] type=1400 audit(1344098782.257:28): apparmor="DENIED" operation="mknod" parent=3922 profile="/usr/sbin/named" name="/var/log/query.log" pid=3927 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 968.514669] type=1400 audit(1344098856.101:29): apparmor="DENIED" operation="mknod" parent=3978 profile="/usr/sbin/named" name="/var/log/query.log" pid=3983 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 1021.814582] type=1400 audit(1344098909.401:30): apparmor="DENIED" operation="mknod" parent=4010 profile="/usr/sbin/named" name="/var/log/query.log" pid=4012 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 1063.856633] type=1400 audit(1344098951.445:31): apparmor="DENIED" operation="mknod" parent=4041 profile="/usr/sbin/named" name="/var/log/query.log" pid=4043 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 1085.404001] type=1400 audit(1344098972.989:32): apparmor="DENIED" operation="mknod" parent=4072 profile="/usr/sbin/named" name="/var/log/query.log" pid=4077 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 1108.207402] type=1400 audit(1344098995.793:33): apparmor="DENIED" operation="mknod" parent=4102 profile="/usr/sbin/named" name="/var/log/query.log" pid=4107 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 1156.947189] type=1400 audit(1344099044.533:34): apparmor="DENIED" operation="mknod" parent=4134 profile="/usr/sbin/named" name="/var/log/query.log" pid=4136 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 1166.768005] type=1400 audit(1344099054.353:35): apparmor="DENIED" operation="mknod" parent=4150 profile="/usr/sbin/named" name="/var/log/query.log" pid=4155 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 1168.873385] type=1400 audit(1344099056.461:36): apparmor="DENIED" operation="mknod" parent=4162 profile="/usr/sbin/named" name="/var/log/query.log" pid=4167 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 1181.558946] type=1400 audit(1344099069.145:37): apparmor="DENIED" operation="mknod" parent=4177 profile="/usr/sbin/named" name="/var/log/query.log" pid=4182 comm="named" requested_mask="c" denied_mask="c" fsuid=0 ouid=0 [ 1199.349265] type=1400 audit(1344099086.937:38): apparmor="DENIED" operation="mknod" parent=4191 profile="/usr/sbin/named" name="/var/log/query.log" pid=4196 comm="named" requested_mask="c" denied_mask="c" fsuid=0 ouid=0 [ 1296.805604] type=1400 audit(1344099184.393:39): apparmor="DENIED" operation="mknod" parent=4232 profile="/usr/sbin/named" name="/var/log/query.log" pid=4237 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 1317.730568] type=1400 audit(1344099205.317:40): apparmor="DENIED" operation="mknod" parent=3325 profile="/usr/sbin/named" name="/tmp-nuBes0IXwi" pid=4251 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 1317.730744] type=1400 audit(1344099205.317:41): apparmor="DENIED" operation="mknod" parent=3325 profile="/usr/sbin/named" name="/tmp-ZDJA06ZOkU" pid=4252 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 1365.072687] type=1400 audit(1344099252.661:42): apparmor="DENIED" operation="mknod" parent=3325 profile="/usr/sbin/named" name="/tmp-EnsuYUrGOC" pid=4290 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 1365.074520] type=1400 audit(1344099252.661:43): apparmor="DENIED" operation="mknod" parent=3325 profile="/usr/sbin/named" name="/tmp-LVCnpWOStP" pid=4287 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 1380.336984] type=1400 audit(1344099267.925:44): apparmor="DENIED" operation="mknod" parent=4617 profile="/usr/sbin/named" name="/var/log/query.log" pid=4622 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 1437.924534] type=1400 audit(1344099325.513:45): apparmor="DENIED" operation="mknod" parent=3325 profile="/usr/sbin/named" name="/tmp-Uyf1dHIZUU" pid=4648 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 1437.924626] type=1400 audit(1344099325.513:46): apparmor="DENIED" operation="mknod" parent=3325 profile="/usr/sbin/named" name="/tmp-OABXWclII3" pid=4647 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 1526.334959] type=1400 audit(1344099413.921:47): apparmor="DENIED" operation="mknod" parent=4749 profile="/usr/sbin/named" name="/var/log/query.log" pid=4754 comm="named" requested_mask="c" denied_mask="c" fsuid=0 ouid=0 [ 1601.292548] type=1400 audit(1344099488.881:48): apparmor="DENIED" operation="mknod" parent=4835 profile="/usr/sbin/named" name="/var/log/query.log" pid=4840 comm="named" requested_mask="c" denied_mask="c" fsuid=0 ouid=0 [ 1639.543733] type=1400 audit(1344099527.129:49): apparmor="DENIED" operation="mknod" parent=4905 profile="/usr/sbin/named" name="/var/log/query.log" pid=4907 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 1916.381179] type=1400 audit(1344099803.969:50): apparmor="DENIED" operation="mknod" parent=4959 profile="/usr/sbin/named" name="/var/log/query.log" pid=4961 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 1940.816898] type=1400 audit(1344099828.405:51): apparmor="DENIED" operation="mknod" parent=4991 profile="/usr/sbin/named" name="/var/log/query.log" pid=4996 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 2043.010898] type=1400 audit(1344099930.597:52): apparmor="DENIED" operation="mknod" parent=5048 profile="/usr/sbin/named" name="/var/log/query.log" pid=5053 comm="named" requested_mask="c" denied_mask="c" fsuid=107 ouid=107 [ 2084.956230] type=1400 audit(1344099972.545:53): apparmor="DENIED" operation="mknod" parent=3325 profile="/usr/sbin/named" name="/var/log/tmp-XYgr33RqUt" pid=5069 comm="named" requested_mask="c" denied_mask="c" fsuid=0 ouid=0 [ 2084.959120] type=1400 audit(1344099972.545:54): apparmor="DENIED" operation="mknod" parent=3325 profile="/usr/sbin/named" name="/var/log/tmp-vO24RHwL14" pid=5066 comm="named" requested_mask="c" denied_mask="c" fsuid=0 ouid=0 [ 2088.169500] type=1400 audit(1344099975.757:55): apparmor="DENIED" operation="mknod" parent=5076 profile="/usr/sbin/named" name="/var/log/query.log" pid=5078 comm="named" requested_mask="c" denied_mask="c" fsuid=0 ouid=0 [ 2165.625096] type=1400 audit(1344100053.213:56): apparmor="STATUS" operation="profile_remove" name="/sbin/dhclient" pid=5124 comm="apparmor" [ 2165.625401] type=1400 audit(1344100053.213:57): apparmor="STATUS" operation="profile_remove" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=5124 comm="apparmor" [ 2165.625608] type=1400 audit(1344100053.213:58): apparmor="STATUS" operation="profile_remove" name="/usr/lib/connman/scripts/dhclient-script" pid=5124 comm="apparmor" [ 2165.625782] type=1400 audit(1344100053.213:59): apparmor="STATUS" operation="profile_remove" name="/usr/lib/libvirt/virt-aa-helper" pid=5124 comm="apparmor" [ 2165.625931] type=1400 audit(1344100053.213:60): apparmor="STATUS" operation="profile_remove" name="/usr/sbin/libvirtd" pid=5124 comm="apparmor" [ 2165.626057] type=1400 audit(1344100053.213:61): apparmor="STATUS" operation="profile_remove" name="/usr/sbin/mysqld" pid=5124 comm="apparmor" [ 2165.626181] type=1400 audit(1344100053.213:62): apparmor="STATUS" operation="profile_remove" name="/usr/sbin/named" pid=5124 comm="apparmor" [ 2165.626319] type=1400 audit(1344100053.213:63): apparmor="STATUS" operation="profile_remove" name="/usr/sbin/tcpdump" pid=5124 comm="apparmor" [ 3709.583927] type=1400 audit(1344101597.169:64): apparmor="STATUS" operation="profile_load" name="/usr/sbin/libvirtd" pid=7484 comm="apparmor_parser" [ 3709.839895] type=1400 audit(1344101597.425:65): apparmor="STATUS" operation="profile_load" name="/usr/sbin/mysqld" pid=7485 comm="apparmor_parser" [ 3710.008892] type=1400 audit(1344101597.597:66): apparmor="STATUS" operation="profile_load" name="/usr/lib/libvirt/virt-aa-helper" pid=7483 comm="apparmor_parser" [ 3710.545232] type=1400 audit(1344101598.133:67): apparmor="STATUS" operation="profile_load" name="/usr/sbin/named" pid=7486 comm="apparmor_parser" [ 3710.655600] type=1400 audit(1344101598.241:68): apparmor="STATUS" operation="profile_load" name="/sbin/dhclient" pid=7481 comm="apparmor_parser" [ 3710.656013] type=1400 audit(1344101598.241:69): apparmor="STATUS" operation="profile_load" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=7481 comm="apparmor_parser" [ 3710.656786] type=1400 audit(1344101598.245:70): apparmor="STATUS" operation="profile_load" name="/usr/lib/connman/scripts/dhclient-script" pid=7481 comm="apparmor_parser" [ 3710.832624] type=1400 audit(1344101598.421:71): apparmor="STATUS" operation="profile_load" name="/usr/sbin/tcpdump" pid=7488 comm="apparmor_parser" [ 3717.573123] type=1400 audit(1344101605.161:72): apparmor="DENIED" operation="open" parent=7505 profile="/usr/sbin/named" name="/var/log/query.log" pid=7510 comm="named" requested_mask="ac" denied_mask="ac" fsuid=107 ouid=0 [ 3743.667808] type=1400 audit(1344101631.253:73): apparmor="STATUS" operation="profile_remove" name="/sbin/dhclient" pid=7552 comm="apparmor" [ 3743.668338] type=1400 audit(1344101631.257:74): apparmor="STATUS" operation="profile_remove" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=7552 comm="apparmor" [ 3743.668625] type=1400 audit(1344101631.257:75): apparmor="STATUS" operation="profile_remove" name="/usr/lib/connman/scripts/dhclient-script" pid=7552 comm="apparmor" [ 3743.668834] type=1400 audit(1344101631.257:76): apparmor="STATUS" operation="profile_remove" name="/usr/lib/libvirt/virt-aa-helper" pid=7552 comm="apparmor" [ 3743.668991] type=1400 audit(1344101631.257:77): apparmor="STATUS" operation="profile_remove" name="/usr/sbin/libvirtd" pid=7552 comm="apparmor" [ 3743.669127] type=1400 audit(1344101631.257:78): apparmor="STATUS" operation="profile_remove" name="/usr/sbin/mysqld" pid=7552 comm="apparmor" [ 3743.669282] type=1400 audit(1344101631.257:79): apparmor="STATUS" operation="profile_remove" name="/usr/sbin/named" pid=7552 comm="apparmor" [ 3743.669520] type=1400 audit(1344101631.257:80): apparmor="STATUS" operation="profile_remove" name="/usr/sbin/tcpdump" pid=7552 comm="apparmor" [ 3873.572336] type=1400 audit(1344101761.161:81): apparmor="STATUS" operation="profile_load" name="/usr/sbin/libvirtd" pid=7722 comm="apparmor_parser" [ 3873.826209] type=1400 audit(1344101761.413:82): apparmor="STATUS" operation="profile_load" name="/usr/sbin/mysqld" pid=7723 comm="apparmor_parser" [ 3873.988181] type=1400 audit(1344101761.577:83): apparmor="STATUS" operation="profile_load" name="/usr/lib/libvirt/virt-aa-helper" pid=7721 comm="apparmor_parser" [ 3874.520305] type=1400 audit(1344101762.109:84): apparmor="STATUS" operation="profile_load" name="/sbin/dhclient" pid=7719 comm="apparmor_parser" [ 3874.520736] type=1400 audit(1344101762.109:85): apparmor="STATUS" operation="profile_load" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=7719 comm="apparmor_parser" [ 3874.521000] type=1400 audit(1344101762.109:86): apparmor="STATUS" operation="profile_load" name="/usr/lib/connman/scripts/dhclient-script" pid=7719 comm="apparmor_parser" [ 3874.528878] type=1400 audit(1344101762.117:87): apparmor="STATUS" operation="profile_load" name="/usr/sbin/named" pid=7724 comm="apparmor_parser" [ 3874.930712] type=1400 audit(1344101762.517:88): apparmor="STATUS" operation="profile_load" name="/usr/sbin/tcpdump" pid=7726 comm="apparmor_parser" [ 3971.744599] type=1400 audit(1344101859.333:89): apparmor="STATUS" operation="profile_replace" name="/usr/sbin/libvirtd" pid=7899 comm="apparmor_parser" [ 3972.009857] type=1400 audit(1344101859.597:90): apparmor="STATUS" operation="profile_replace" name="/usr/sbin/mysqld" pid=7900 comm="apparmor_parser" [ 3972.165297] type=1400 audit(1344101859.753:91): apparmor="STATUS" operation="profile_replace" name="/usr/lib/libvirt/virt-aa-helper" pid=7898 comm="apparmor_parser" [ 3972.587766] type=1400 audit(1344101860.173:92): apparmor="STATUS" operation="profile_replace" name="/usr/sbin/named" pid=7901 comm="apparmor_parser" [ 3972.847189] type=1400 audit(1344101860.433:93): apparmor="STATUS" operation="profile_replace" name="/sbin/dhclient" pid=7896 comm="apparmor_parser" [ 3972.847705] type=1400 audit(1344101860.433:94): apparmor="STATUS" operation="profile_replace" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=7896 comm="apparmor_parser" [ 3972.848150] type=1400 audit(1344101860.433:95): apparmor="STATUS" operation="profile_replace" name="/usr/lib/connman/scripts/dhclient-script" pid=7896 comm="apparmor_parser" [ 3973.147889] type=1400 audit(1344101860.733:96): apparmor="STATUS" operation="profile_replace" name="/usr/sbin/tcpdump" pid=7903 comm="apparmor_parser" [ 3988.863999] type=1400 audit(1344101876.449:97): apparmor="DENIED" operation="open" parent=7939 profile="/usr/sbin/named" name="/var/log/query.log" pid=7944 comm="named" requested_mask="ac" denied_mask="ac" fsuid=107 ouid=0 [ 4025.826132] type=1400 audit(1344101913.413:98): apparmor="STATUS" operation="profile_remove" name="/sbin/dhclient" pid=7975 comm="apparmor" [ 4025.826627] type=1400 audit(1344101913.413:99): apparmor="STATUS" operation="profile_remove" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=7975 comm="apparmor" [ 4025.826861] type=1400 audit(1344101913.413:100): apparmor="STATUS" operation="profile_remove" name="/usr/lib/connman/scripts/dhclient-script" pid=7975 comm="apparmor" [ 4025.827059] type=1400 audit(1344101913.413:101): apparmor="STATUS" operation="profile_remove" name="/usr/lib/libvirt/virt-aa-helper" pid=7975 comm="apparmor" [ 4025.827214] type=1400 audit(1344101913.413:102): apparmor="STATUS" operation="profile_remove" name="/usr/sbin/libvirtd" pid=7975 comm="apparmor" [ 4025.827352] type=1400 audit(1344101913.413:103): apparmor="STATUS" operation="profile_remove" name="/usr/sbin/mysqld" pid=7975 comm="apparmor" [ 4025.827485] type=1400 audit(1344101913.413:104): apparmor="STATUS" operation="profile_remove" name="/usr/sbin/named" pid=7975 comm="apparmor" [ 4025.827624] type=1400 audit(1344101913.413:105): apparmor="STATUS" operation="profile_remove" name="/usr/sbin/tcpdump" pid=7975 comm="apparmor" [ 4027.862198] type=1400 audit(1344101915.449:106): apparmor="STATUS" operation="profile_load" name="/usr/sbin/libvirtd" pid=8090 comm="apparmor_parser" [ 4039.500920] audit_printk_skb: 21 callbacks suppressed [ 4039.500932] type=1400 audit(1344101927.089:114): apparmor="STATUS" operation="profile_remove" name="/sbin/dhclient" pid=8114 comm="apparmor" [ 4039.501413] type=1400 audit(1344101927.089:115): apparmor="STATUS" operation="profile_remove" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=8114 comm="apparmor" [ 4039.501672] type=1400 audit(1344101927.089:116): apparmor="STATUS" operation="profile_remove" name="/usr/lib/connman/scripts/dhclient-script" pid=8114 comm="apparmor" [ 4039.501861] type=1400 audit(1344101927.089:117): apparmor="STATUS" operation="profile_remove" name="/usr/lib/libvirt/virt-aa-helper" pid=8114 comm="apparmor" [ 4039.502033] type=1400 audit(1344101927.089:118): apparmor="STATUS" operation="profile_remove" name="/usr/sbin/libvirtd" pid=8114 comm="apparmor" [ 4039.502170] type=1400 audit(1344101927.089:119): apparmor="STATUS" operation="profile_remove" name="/usr/sbin/mysqld" pid=8114 comm="apparmor" [ 4039.502305] type=1400 audit(1344101927.089:120): apparmor="STATUS" operation="profile_remove" name="/usr/sbin/named" pid=8114 comm="apparmor" [ 4039.502442] type=1400 audit(1344101927.089:121): apparmor="STATUS" operation="profile_remove" name="/usr/sbin/tcpdump" pid=8114 comm="apparmor" [ 4041.425405] type=1400 audit(1344101929.013:122): apparmor="STATUS" operation="profile_load" name="/usr/lib/libvirt/virt-aa-helper" pid=8240 comm="apparmor_parser" [ 4041.425952] type=1400 audit(1344101929.013:123): apparmor="STATUS" operation="profile_load" name="/sbin/dhclient" pid=8238 comm="apparmor_parser" [ 4058.910390] audit_printk_skb: 18 callbacks suppressed [ 4058.910401] type=1400 audit(1344101946.497:130): apparmor="STATUS" operation="profile_remove" name="/sbin/dhclient" pid=8264 comm="apparmor" [ 4058.910757] type=1400 audit(1344101946.497:131): apparmor="STATUS" operation="profile_remove" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=8264 comm="apparmor" [ 4058.910969] type=1400 audit(1344101946.497:132): apparmor="STATUS" operation="profile_remove" name="/usr/lib/connman/scripts/dhclient-script" pid=8264 comm="apparmor" [ 4058.911185] type=1400 audit(1344101946.497:133): apparmor="STATUS" operation="profile_remove" name="/usr/lib/libvirt/virt-aa-helper" pid=8264 comm="apparmor" [ 4058.911335] type=1400 audit(1344101946.497:134): apparmor="STATUS" operation="profile_remove" name="/usr/sbin/libvirtd" pid=8264 comm="apparmor" [ 4058.911595] type=1400 audit(1344101946.497:135): apparmor="STATUS" operation="profile_remove" name="/usr/sbin/mysqld" pid=8264 comm="apparmor" [ 4058.911856] type=1400 audit(1344101946.497:136): apparmor="STATUS" operation="profile_remove" name="/usr/sbin/named" pid=8264 comm="apparmor" [ 4058.912001] type=1400 audit(1344101946.497:137): apparmor="STATUS" operation="profile_remove" name="/usr/sbin/tcpdump" pid=8264 comm="apparmor" [ 4060.266700] type=1400 audit(1344101947.853:138): apparmor="STATUS" operation="profile_load" name="/sbin/dhclient" pid=8391 comm="apparmor_parser" [ 4060.268356] type=1400 audit(1344101947.857:139): apparmor="STATUS" operation="profile_load" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=8391 comm="apparmor_parser" [ 5909.432749] audit_printk_skb: 18 callbacks suppressed [ 5909.432759] type=1400 audit(1344103797.021:146): apparmor="DENIED" operation="open" parent=8800 profile="/usr/sbin/named" name="/var/log/query.log" pid=8805 comm="named" requested_mask="ac" denied_mask="ac" fsuid=107 ouid=0 root@zotac:~# What can I do that it still works and I don't have to disable apparmor ?

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  • Syncing Data with a Server using Silverlight and HTTP Polling Duplex

    - by dwahlin
    Many applications have the need to stay in-sync with data provided by a service. Although web applications typically rely on standard polling techniques to check if data has changed, Silverlight provides several interesting options for keeping an application in-sync that rely on server “push” technologies. A few years back I wrote several blog posts covering different “push” technologies available in Silverlight that rely on sockets or HTTP Polling Duplex. We recently had a project that looked like it could benefit from pushing data from a server to one or more clients so I thought I’d revisit the subject and provide some updates to the original code posted. If you’ve worked with AJAX before in Web applications then you know that until browsers fully support web sockets or other duplex (bi-directional communication) technologies that it’s difficult to keep applications in-sync with a server without relying on polling. The problem with polling is that you have to check for changes on the server on a timed-basis which can often be wasteful and take up unnecessary resources. With server “push” technologies, data can be pushed from the server to the client as it changes. Once the data is received, the client can update the user interface as appropriate. Using “push” technologies allows the client to listen for changes from the data but stay 100% focused on client activities as opposed to worrying about polling and asking the server if anything has changed. Silverlight provides several options for pushing data from a server to a client including sockets, TCP bindings and HTTP Polling Duplex.  Each has its own strengths and weaknesses as far as performance and setup work with HTTP Polling Duplex arguably being the easiest to setup and get going.  In this article I’ll demonstrate how HTTP Polling Duplex can be used in Silverlight 4 applications to push data and show how you can create a WCF server that provides an HTTP Polling Duplex binding that a Silverlight client can consume.   What is HTTP Polling Duplex? Technologies that allow data to be pushed from a server to a client rely on duplex functionality. Duplex (or bi-directional) communication allows data to be passed in both directions.  A client can call a service and the server can call the client. HTTP Polling Duplex (as its name implies) allows a server to communicate with a client without forcing the client to constantly poll the server. It has the benefit of being able to run on port 80 making setup a breeze compared to the other options which require specific ports to be used and cross-domain policy files to be exposed on port 943 (as with sockets and TCP bindings). Having said that, if you’re looking for the best speed possible then sockets and TCP bindings are the way to go. But, they’re not the only game in town when it comes to duplex communication. The first time I heard about HTTP Polling Duplex (initially available in Silverlight 2) I wasn’t exactly sure how it was any better than standard polling used in AJAX applications. I read the Silverlight SDK, looked at various resources and generally found the following definition unhelpful as far as understanding the actual benefits that HTTP Polling Duplex provided: "The Silverlight client periodically polls the service on the network layer, and checks for any new messages that the service wants to send on the callback channel. The service queues all messages sent on the client callback channel and delivers them to the client when the client polls the service." Although the previous definition explained the overall process, it sounded as if standard polling was used. Fortunately, Microsoft’s Scott Guthrie provided me with a more clear definition several years back that explains the benefits provided by HTTP Polling Duplex quite well (used with his permission): "The [HTTP Polling Duplex] duplex support does use polling in the background to implement notifications – although the way it does it is different than manual polling. It initiates a network request, and then the request is effectively “put to sleep” waiting for the server to respond (it doesn’t come back immediately). The server then keeps the connection open but not active until it has something to send back (or the connection times out after 90 seconds – at which point the duplex client will connect again and wait). This way you are avoiding hitting the server repeatedly – but still get an immediate response when there is data to send." After hearing Scott’s definition the light bulb went on and it all made sense. A client makes a request to a server to check for changes, but instead of the request returning immediately, it parks itself on the server and waits for data. It’s kind of like waiting to pick up a pizza at the store. Instead of calling the store over and over to check the status, you sit in the store and wait until the pizza (the request data) is ready. Once it’s ready you take it back home (to the client). This technique provides a lot of efficiency gains over standard polling techniques even though it does use some polling of its own as a request is initially made from a client to a server. So how do you implement HTTP Polling Duplex in your Silverlight applications? Let’s take a look at the process by starting with the server. Creating an HTTP Polling Duplex WCF Service Creating a WCF service that exposes an HTTP Polling Duplex binding is straightforward as far as coding goes. Add some one way operations into an interface, create a client callback interface and you’re ready to go. The most challenging part comes into play when configuring the service to properly support the necessary binding and that’s more of a cut and paste operation once you know the configuration code to use. To create an HTTP Polling Duplex service you’ll need to expose server-side and client-side interfaces and reference the System.ServiceModel.PollingDuplex assembly (located at C:\Program Files (x86)\Microsoft SDKs\Silverlight\v4.0\Libraries\Server on my machine) in the server project. For the demo application I upgraded a basketball simulation service to support the latest polling duplex assemblies. The service simulates a simple basketball game using a Game class and pushes information about the game such as score, fouls, shots and more to the client as the game changes over time. Before jumping too far into the game push service, it’s important to discuss two interfaces used by the service to communicate in a bi-directional manner. The first is called IGameStreamService and defines the methods/operations that the client can call on the server (see Listing 1). The second is IGameStreamClient which defines the callback methods that a server can use to communicate with a client (see Listing 2).   [ServiceContract(Namespace = "Silverlight", CallbackContract = typeof(IGameStreamClient))] public interface IGameStreamService { [OperationContract(IsOneWay = true)] void GetTeamData(); } Listing 1. The IGameStreamService interface defines server operations that can be called on the server.   [ServiceContract] public interface IGameStreamClient { [OperationContract(IsOneWay = true)] void ReceiveTeamData(List<Team> teamData); [OperationContract(IsOneWay = true, AsyncPattern=true)] IAsyncResult BeginReceiveGameData(GameData gameData, AsyncCallback callback, object state); void EndReceiveGameData(IAsyncResult result); } Listing 2. The IGameStreamClient interfaces defines client operations that a server can call.   The IGameStreamService interface is decorated with the standard ServiceContract attribute but also contains a value for the CallbackContract property.  This property is used to define the interface that the client will expose (IGameStreamClient in this example) and use to receive data pushed from the service. Notice that each OperationContract attribute in both interfaces sets the IsOneWay property to true. This means that the operation can be called and passed data as appropriate, however, no data will be passed back. Instead, data will be pushed back to the client as it’s available.  Looking through the IGameStreamService interface you can see that the client can request team data whereas the IGameStreamClient interface allows team and game data to be received by the client. One interesting point about the IGameStreamClient interface is the inclusion of the AsyncPattern property on the BeginReceiveGameData operation. I initially created this operation as a standard one way operation and it worked most of the time. However, as I disconnected clients and reconnected new ones game data wasn’t being passed properly. After researching the problem more I realized that because the service could take up to 7 seconds to return game data, things were getting hung up. By setting the AsyncPattern property to true on the BeginReceivedGameData operation and providing a corresponding EndReceiveGameData operation I was able to get around this problem and get everything running properly. I’ll provide more details on the implementation of these two methods later in this post. Once the interfaces were created I moved on to the game service class. The first order of business was to create a class that implemented the IGameStreamService interface. Since the service can be used by multiple clients wanting game data I added the ServiceBehavior attribute to the class definition so that I could set its InstanceContextMode to InstanceContextMode.Single (in effect creating a Singleton service object). Listing 3 shows the game service class as well as its fields and constructor.   [ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple, InstanceContextMode = InstanceContextMode.Single)] public class GameStreamService : IGameStreamService { object _Key = new object(); Game _Game = null; Timer _Timer = null; Random _Random = null; Dictionary<string, IGameStreamClient> _ClientCallbacks = new Dictionary<string, IGameStreamClient>(); static AsyncCallback _ReceiveGameDataCompleted = new AsyncCallback(ReceiveGameDataCompleted); public GameStreamService() { _Game = new Game(); _Timer = new Timer { Enabled = false, Interval = 2000, AutoReset = true }; _Timer.Elapsed += new ElapsedEventHandler(_Timer_Elapsed); _Timer.Start(); _Random = new Random(); }} Listing 3. The GameStreamService implements the IGameStreamService interface which defines a callback contract that allows the service class to push data back to the client. By implementing the IGameStreamService interface, GameStreamService must supply a GetTeamData() method which is responsible for supplying information about the teams that are playing as well as individual players.  GetTeamData() also acts as a client subscription method that tracks clients wanting to receive game data.  Listing 4 shows the GetTeamData() method. public void GetTeamData() { //Get client callback channel var context = OperationContext.Current; var sessionID = context.SessionId; var currClient = context.GetCallbackChannel<IGameStreamClient>(); context.Channel.Faulted += Disconnect; context.Channel.Closed += Disconnect; IGameStreamClient client; if (!_ClientCallbacks.TryGetValue(sessionID, out client)) { lock (_Key) { _ClientCallbacks[sessionID] = currClient; } } currClient.ReceiveTeamData(_Game.GetTeamData()); //Start timer which when fired sends updated score information to client if (!_Timer.Enabled) { _Timer.Enabled = true; } } Listing 4. The GetTeamData() method subscribes a given client to the game service and returns. The key the line of code in the GetTeamData() method is the call to GetCallbackChannel<IGameStreamClient>().  This method is responsible for accessing the calling client’s callback channel. The callback channel is defined by the IGameStreamClient interface shown earlier in Listing 2 and used by the server to communicate with the client. Before passing team data back to the client, GetTeamData() grabs the client’s session ID and checks if it already exists in the _ClientCallbacks dictionary object used to track clients wanting callbacks from the server. If the client doesn’t exist it adds it into the collection. It then pushes team data from the Game class back to the client by calling ReceiveTeamData().  Since the service simulates a basketball game, a timer is then started if it’s not already enabled which is then used to randomly send data to the client. When the timer fires, game data is pushed down to the client. Listing 5 shows the _Timer_Elapsed() method that is called when the timer fires as well as the SendGameData() method used to send data to the client. void _Timer_Elapsed(object sender, ElapsedEventArgs e) { int interval = _Random.Next(3000, 7000); lock (_Key) { _Timer.Interval = interval; _Timer.Enabled = false; } SendGameData(_Game.GetGameData()); } private void SendGameData(GameData gameData) { var cbs = _ClientCallbacks.Where(cb => ((IContextChannel)cb.Value).State == CommunicationState.Opened); for (int i = 0; i < cbs.Count(); i++) { var cb = cbs.ElementAt(i).Value; try { cb.BeginReceiveGameData(gameData, _ReceiveGameDataCompleted, cb); } catch (TimeoutException texp) { //Log timeout error } catch (CommunicationException cexp) { //Log communication error } } lock (_Key) _Timer.Enabled = true; } private static void ReceiveGameDataCompleted(IAsyncResult result) { try { ((IGameStreamClient)(result.AsyncState)).EndReceiveGameData(result); } catch (CommunicationException) { // empty } catch (TimeoutException) { // empty } } LIsting 5. _Timer_Elapsed is used to simulate time in a basketball game. When _Timer_Elapsed() fires the SendGameData() method is called which iterates through the clients wanting to be notified of changes. As each client is identified, their respective BeginReceiveGameData() method is called which ultimately pushes game data down to the client. Recall that this method was defined in the client callback interface named IGameStreamClient shown earlier in Listing 2. Notice that BeginReceiveGameData() accepts _ReceiveGameDataCompleted as its second parameter (an AsyncCallback delegate defined in the service class) and passes the client callback as the third parameter. The initial version of the sample application had a standard ReceiveGameData() method in the client callback interface. However, sometimes the client callbacks would work properly and sometimes they wouldn’t which was a little baffling at first glance. After some investigation I realized that I needed to implement an asynchronous pattern for client callbacks to work properly since 3 – 7 second delays are occurring as a result of the timer. Once I added the BeginReceiveGameData() and ReceiveGameDataCompleted() methods everything worked properly since each call was handled in an asynchronous manner. The final task that had to be completed to get the server working properly with HTTP Polling Duplex was adding configuration code into web.config. In the interest of brevity I won’t post all of the code here since the sample application includes everything you need. However, Listing 6 shows the key configuration code to handle creating a custom binding named pollingDuplexBinding and associate it with the service’s endpoint.   <bindings> <customBinding> <binding name="pollingDuplexBinding"> <binaryMessageEncoding /> <pollingDuplex maxPendingSessions="2147483647" maxPendingMessagesPerSession="2147483647" inactivityTimeout="02:00:00" serverPollTimeout="00:05:00"/> <httpTransport /> </binding> </customBinding> </bindings> <services> <service name="GameService.GameStreamService" behaviorConfiguration="GameStreamServiceBehavior"> <endpoint address="" binding="customBinding" bindingConfiguration="pollingDuplexBinding" contract="GameService.IGameStreamService"/> <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" /> </service> </services>   Listing 6. Configuring an HTTP Polling Duplex binding in web.config and associating an endpoint with it. Calling the Service and Receiving “Pushed” Data Calling the service and handling data that is pushed from the server is a simple and straightforward process in Silverlight. Since the service is configured with a MEX endpoint and exposes a WSDL file, you can right-click on the Silverlight project and select the standard Add Service Reference item. After the web service proxy is created you may notice that the ServiceReferences.ClientConfig file only contains an empty configuration element instead of the normal configuration elements created when creating a standard WCF proxy. You can certainly update the file if you want to read from it at runtime but for the sample application I fed the service URI directly to the service proxy as shown next: var address = new EndpointAddress("http://localhost.:5661/GameStreamService.svc"); var binding = new PollingDuplexHttpBinding(); _Proxy = new GameStreamServiceClient(binding, address); _Proxy.ReceiveTeamDataReceived += _Proxy_ReceiveTeamDataReceived; _Proxy.ReceiveGameDataReceived += _Proxy_ReceiveGameDataReceived; _Proxy.GetTeamDataAsync(); This code creates the proxy and passes the endpoint address and binding to use to its constructor. It then wires the different receive events to callback methods and calls GetTeamDataAsync().  Calling GetTeamDataAsync() causes the server to store the client in the server-side dictionary collection mentioned earlier so that it can receive data that is pushed.  As the server-side timer fires and game data is pushed to the client, the user interface is updated as shown in Listing 7. Listing 8 shows the _Proxy_ReceiveGameDataReceived() method responsible for handling the data and calling UpdateGameData() to process it.   Listing 7. The Silverlight interface. Game data is pushed from the server to the client using HTTP Polling Duplex. void _Proxy_ReceiveGameDataReceived(object sender, ReceiveGameDataReceivedEventArgs e) { UpdateGameData(e.gameData); } private void UpdateGameData(GameData gameData) { //Update Score this.tbTeam1Score.Text = gameData.Team1Score.ToString(); this.tbTeam2Score.Text = gameData.Team2Score.ToString(); //Update ball visibility if (gameData.Action != ActionsEnum.Foul) { if (tbTeam1.Text == gameData.TeamOnOffense) { AnimateBall(this.BB1, this.BB2); } else //Team 2 { AnimateBall(this.BB2, this.BB1); } } if (this.lbActions.Items.Count > 9) this.lbActions.Items.Clear(); this.lbActions.Items.Add(gameData.LastAction); if (this.lbActions.Visibility == Visibility.Collapsed) this.lbActions.Visibility = Visibility.Visible; } private void AnimateBall(Image onBall, Image offBall) { this.FadeIn.Stop(); Storyboard.SetTarget(this.FadeInAnimation, onBall); Storyboard.SetTarget(this.FadeOutAnimation, offBall); this.FadeIn.Begin(); } Listing 8. As the server pushes game data, the client’s _Proxy_ReceiveGameDataReceived() method is called to process the data. In a real-life application I’d go with a ViewModel class to handle retrieving team data, setup data bindings and handle data that is pushed from the server. However, for the sample application I wanted to focus on HTTP Polling Duplex and keep things as simple as possible.   Summary Silverlight supports three options when duplex communication is required in an application including TCP bindins, sockets and HTTP Polling Duplex. In this post you’ve seen how HTTP Polling Duplex interfaces can be created and implemented on the server as well as how they can be consumed by a Silverlight client. HTTP Polling Duplex provides a nice way to “push” data from a server while still allowing the data to flow over port 80 or another port of your choice.   Sample Application Download

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  • Speed-start your Linux App: Using DB2 and the DB2 Control Center

    This article guides you through setting up and using IBM DB2 7.2 with the Command Line Processor. You'll also learn to use the graphical Control Center, which helps you explore and control your databases, and the graphical Command Center, which helps you generate SQL queries. Other topics covered include Java runtime environment setup, useful Linux utility functions, and bash profile customization.

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  • REST Framework - MS Web Api vs the rest of the field

    - by Mike
    I am a .NET developer who is looking into the OSS world for a REST framework similar to Microsoft's Web Api. I'll be starting a personal project soon and need to develop both a web site and an API with the API coming first. I've ruled out Ruby on Rails just because I feel that with my background in C#, I can get up to speed quickly with either a Java or PHP based framework. So far I've looked at Slim (PHP) and JAX-RS and Jersey (Java). Would I want to consider any others? My API will be private at first with a public one on the roadmap. I'll be hosting the API on Heroku or some cloud based service.

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  • Simultaneously calling multiple methods on a WCF service from silverlight

    - by ola karlsson
    A while back I had to debug some performance issues in an existing Silverlight app, as the problem / solution was a bit obscure and finding info about it was quite tricky, I thought I’d share, maybe it can help the next person with this problem. The App On start, the app would do a number of calls to different methods on a WCF service, this to populate the UI with the necessary data. Recently one of those services had been changed and was now taking quite a bit longer than it used to. This was resulting in quite a long loading time for the whole UI, which was set up so it wouldn’t let the user interact with anything, until all the service calls had finished. First I broke out the longer running service call from the others, then removed the constraint that it had to be loaded for the UI in general to become responsive. I also added a loading indicator just on that area of the UI, thinking that the main UI would load while this particular section could keep loading independently. The Problem However this is where things started to get a bit strange. I found that even after these changes, the main UI wouldn’t activate until the long running call returned. So now, I did what I should have done to start with, I got Fiddler out and had a look at what was really happening. What I found was that, once the call to the long running service method was placed, all subsequent call were waiting for that one to return before executing. Not having really worked with WCF previously or knowing much about it in general, I was stumped… I knew of the issues where Silverlight is restricted by the browsers networking features in regards to number of simultaneous connections etc. However that just didn’t seem to be the issue here, you can clearly see in Fiddler that there’s numerous calls, but they’re just not returning. I thought of the problem maybe being in the WCF service, but the calls were really not that complicated and surely the service should be able to handle a lot more than what I was throwing at it! So I did what every developer does in this type of scenario, I hit the search engines. I did a whole bunch of searching on things like “multiple simultaneous WCF calls from Silverlight” and “Calling long running WCF services from Silverlight” etc. etc. This however, pretty much got me nowhere, I found a whole heap of resources on how to do WCF calls from Silverlight but most of them were very basic and of no use what so ever. The fog is clearing It wasn’t until I came across the term “ WCF blocking calls” and started incorporating that in my searches I started to get somewhere. Those searches quite quickly brought me to the following thread in the Silverlight forum “Long-running WCF call blocking subsequent calls” which discussed the exact problem I was facing and the best part, one of the guys there had the solution! The short answer is in the forum post and the guys answering, has also done a more extensive blog post about it called “Silverlight, WCF, and ASP.Net Configuration Gotchas” which covers it very well.  So come on what’s the solution?! I heard you ask, unless you’ve already gone to the links and looked it up ;) The Solution Well, it turns out that the issue is founded in a mix of Silverlight, Asp.Net and WCF, basically if you’re doing multiple calls to a single WCF web-service and you have Asp.Net session state enabled, the calls will be executed sequentially by the service, hence any long running calls will block subsequent ones. So why is Asp.Net session state effecting us, we’re working in Silverlight, right? We'll as mentioned earlier, by default Silverlight uses the browsers networking stack when doing service calls, hence to the WCF service, the call looks like it might as well be coming from a normal Asp.Net. To get around this, we look to a feature introduced in Silverlight 3, namely the Client HTTP Stack. The Client HTTP Stack to the rescue By using the following syntax (for example in our App.xaml.cs, Application_Startup method) WebRequest.RegisterPrefix("http://", WebRequestCreator.ClientHttp); we can set our Silverlight application to use the Client HTTP Stack, which incidentally solves our problem! By using Silverlights own networking stack, rather than that of the browser, we get around the Asp.Net - WCF session state issue. The above code specifies that all calls to addresses starting with “http://” should go through the client stack, this can actually be set more granular and you can specify it to be used only for certain domains etc. Summary The actual solution is well covered in the forum and blog posts I link to above. This post is more about sharing my experience, hopefully helping to spread the word about this and maybe make it a bit easier for the next poor guy with this issue to find the solution. Until next time, Ola

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